What is the trigger point for Reprice and Generate billing schedule action in service contract

Hi Experts,

Tried to update the contract header and line amount using SOAP/REST APIs for service contract to update the contract price. I am able to update the contract line amount, and it automatically reflects to contract header as well, but billing summary remains unchanged it is having the old price only.

That means if I update the price from backend, in that case I am doing force price update and that's why repricing also not happening from application on the same updated contract.

Following is the screenshot-

—>Questions on service contract Actions?

1- What is the triggering point for the actions "Reprice" and "Generate Billing Schedule" for these two actions? —> highlighted in the attached screenshot - Reprice_GeneBillSchedule.jpg.